Rennala's Greatrune

Rennala's Greatrune cannot be equipped to you
until Rennala, Moon Incarnate Dies or is
removed from play.
Once on your turn, you may copy target instant
or sorcery and choose new targets for the copy.
(you may choose instants and sorceries from your
graveyard as well).
On your upkeep, target creature you choose has
Spellcast until your next upkeep.